Among the more than 300 million Americans, more than 184 million people choose CDMA mobile phones, which shows that more than half of Americans like to use CDMA. Derived from military mobile technology Speaking of the spread spectrum technology used by CDMA, the origins can be traced back to the period of World War II. The original intention of the technology at that time was to prevent the enemy's interference and solve the problem of clear communication in the electronic interference environment of the battlefield. CDMA became the handy wireless secret communication technology of the US military at that time. The communication signal of CDMA is extremely concealed. The spectrum of the information signal is greatly expanded after spread spectrum modulation, which greatly reduces the power spectral density of the signal. The signal spectral density received by the receiving end is lower than the noise of the receiver, that is, the signal is completely submerged in In the noise, it will not interfere with the reception of other radio stations in the same frequency band, and the signal will not be easily found. It is more difficult to detect the signal further, so it has a very high concealment. Due to the unparalleled advantages of spread spectrum communication, it has been widely used in many fields such as wireless communication and computer wireless network. Unexpected "Mother of CDMA" When it comes to CDMA technology, you must mention "Mother of CDMA"-Heidi Rama is a famous sexy star of the last century. In the 2005 biography of Qualcomm, a well-known engineer and analyst in the global telecommunications and communications technology industry, Mok described this contradictory genius character in this text: "As long as you have used a mobile phone, you need to understand And thank her. You know, this sexy female star's contribution to global wireless communication technology has been unmatched so far. "Heidi Rama was once a glamorous star, and she is also a female inventor In collaboration with others, she invented the "spread spectrum communication technology", which is widely used in today's mobile phones, satellite communications and wireless Internet. She is therefore regarded by future generations as "the mother of CDMA". CDMA, the first choice for healthy people Many Chinese users said, "The advantages of confidentiality, network signals and environmental protection of the US communication network, and stable and fast Internet access can now be enjoyed by China Telecom (Weibo), very happy!" In the past, the commonly used mobile phones had a lot of radiation. If you put the mobile phone next to the computer or TV, and you do not wait for the ringtone to ring when you call, you can see strong signal interference on the screen, but CDMA mobile phones will not have this phenomenon. Therefore, doctors and nurses in the hospital, as well as pregnant women and the elderly, prefer to use CDMA mobile phones, because they no longer need to worry about health problems when using CDMA mobile phones, and CDMA mobile phones can also eliminate environmental noise and have first-class call quality. In China, China Telecom operates a CDMA network under the brand name Tianyi. According to statistics, since China Telecom operated the CDMA network, users have grown very rapidly. From 2009 to 2012, Tianyi CDMA users were 55.09 million, 90.52 million, 126 million, and 170 million, respectively. Industry experts analyzed, "According to China Telecom's development momentum and the domestic economic development background, China Telecom's CDMA users have no suspense over the United States." In the future, CDMA users will exceed 200 million. So, are you one in two hundred million?
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Why the US likes to use CDMA derived from military mobile technology
Recently, a micro-blog "Why do Americans like to use CDMA" has become a hot topic for netizens to discuss and forward on the Internet. Some of Weibo's content is as follows: "The United States has more than 184 million CDMA2000 users and more than 6 million LTE users. Many Americans voluntarily join in the advantages of confidentiality, network signals and green environmental protection, and the team is growing. It has gradually become a trend in the United States. "